you need to do deeper research about particular coin that you think will be good coin to choose. but personally, i can not do that without any help from my friends, the only thing i knew that looking for coin that has much volume in 24 hours. look at the buy order, how many people interested on that coin, look at the price historical, try to predict as well. you can share with your friend who has enough knowledge about how to choose good coin. then learn what they teach you.